21 Monocerotis

Above the horizon. Rise: 2:49 | Tran: 8:45 | Set: 14:41

Alt: 37.99° Az: 186.62° Direction: South

21 Monocerotis is a variable main-sequence star of spectral class A8 in the constellation of Monoceros.

21 Monocerotis visual magnitude is 5.45. Because of its faintness, 21 Monocerotis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 21 Monocerotis. The red arrow shows the motion of 21 Monocerotis during the next 10000 years (-5.17 arcmin in Right Ascension and -1.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 07h 12m 39s

Declination -00° 20’ 40”

Hour Angle 00h 20m 50s

Sideral Time 07h 33m 30s

J2000

Right Ascension 07h 11m 23s

Declination -00° 18’ 06”

Galactic Coordinates

Galactic Longitude 215.48°

Galactic Latitude 4.3°

Finder Chart

Simplified finder chart for 21 Monocerotis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.45

Class Main-sequence

Absolute magnitude 0.93

Spectral Type A8V

Color Index (B-V) 0.29

Temperature 7526K

The red dot in the diagram below shows where 21 Monocerotis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 21 Monocerotis. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

21 Monocerotis is distant 261.01 light years from the Sun and it is moving far from the Sun at the speed of 30 kilometers per second.

Distance (parsec) 80.06

Distance (light year) 261.01

Radial Speed 30 km/s

Proper Motion RA -0.031 arcsec/y

Proper Motion Dec -0.011"/y

Alternative Designations

Flamsteed designation 21 Monocerotis

Henry Draper Catalogue HD55057

SAO Catalogue SAO134316

Hipparcos Catalogue HIP34724

Durchmusterung Catalogue BD-00 1634

General Catalogue of Variable Stars V571 Mon

Visibility from Your Location

Today's 21 Monocerotis rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 90.3° RISE 2:49

Max altitude: 38.2° TRANSIT 8:45

Azimuth: 269.7° SET 14:41

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Monoceros